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Finding the Fourth Proportional to 844.91, 1,267.79 and 639.41

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Solution

The fourth proportional to 844.91, 1,267.79 and 639.41 is: 959.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    844.91 : 1,267.79 = 639.41 : x
  2. Step 2: Convert to fraction form
    844.91/1,267.79 = 639.41/x
  3. Step 3: Cross multiply
    844.91x = 1,267.79 × 639.41
  4. Step 4: Simplify right side
    844.91x = 810,632.86
  5. Step 5: Solve for x
    x = 810,632.86/844.91
  6. Step 6: Final answer
    x = 959.44

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.